feat: cross-chain price oracle integration#89
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memplethee-lab merged 1 commit intoJun 24, 2026
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- Add PriceRecord entity with SupportedChain (ETH/BSC/POLY/ARB/OPT/AVAX) and PriceSource enums - Add PriceFeedService with Chainlink, Band Protocol, and Uniswap V3 TWAP adapters - Aggregate prices via median; emit price.deviation event when sources diverge >5% - Persist all price fetches to price_records table for 2-year historical retention - Add PriceFeedController: GET /price-feed/:chain/:asset and GET /price-feed/:chain/:asset/history - Register PriceRecord entity in OracleModule and AppModule - Add BSC_RPC_URL to env.validation.ts and .env.example - Add 13 unit tests covering aggregation, deviation alerting, persistence, and history queries
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Summary
Implements multi-chain price feed support across Ethereum, BSC, Polygon, Arbitrum, Optimism, and Avalanche with aggregation from multiple on-chain data sources.
Changes
PriceRecordentity — stores historical prices per asset/chain with source breakdown, deviation flag, and timestamp (satisfies 2-year retention requirement via persistent DB)PriceFeedService— fetches prices from Chainlink AggregatorV3, Band Protocol StdReference, and Uniswap V3 TWAP per chain; computes median as canonical price; emitsprice.deviationevent when any two sources diverge >5%PriceFeedController— two public endpoints:GET /price-feed/:chain/:asset— current aggregated priceGET /price-feed/:chain/:asset/history— historical records (up to 1000)OracleModule— wired in new service, controller, and entityAppModule— registeredPriceRecordentityBSC_RPC_URLtoenv.validation.tsand.env.exampleAcceptance Criteria
Closes #68